Cc Bg 1920 1280
Glycine Caliber GL293

Glycine Caliber GL293

Caliber NumberGL 293, GL293
Base CaliberETA 2893-2 or Sellita SW330-1
Movement TypeAutomatic
4.10mm thick
Jewels21/24 (ETA) / 25 (Sellita)
Power Reserve~42 hours (46 for the older A07 base)
Vibrations Per Hour28,800 bph
Shock SystemIncabloc
FeaturesCentral hours; central minutes; central sweeping seconds; central GMT hand; date at 3:00
Country of ManufactureSwitzerland, Swiss made
Known ModelsAirman No. 1, Airman 17, Airman 18, Airman Base 22, Airman Base 22 Mystery, Airman 1953 Vintage, Airman Vintage “The Chief”, Airman SST

The Glycine caliber GL 293 is a Swiss made automatic watch movement with different specs depending on which base is used (see below). As of 2016, Glycine Watch SA is owned by Invicta Watch Group.

In Glycine’s own words:

The ETA 2893-2 automatic movement, that was the heart of most Airman watches since it was reintroduced as mechanical watch back in 1998, became the GL 293 Swiss automatic movement.” -Source: Glycine Airman catalog, published in 2010, before ETA production was limited and brands started using Sellita (ETA clones) as alternatives.

ETA or Sellita Base:

The Glycine caliber GL293 is found in the Airman 17. Early Glycine Airman 17 watches with the GL 293 caliber were based on ETA caliber A07.171 Valgranges movements, but the model later changed to the GL 293 being based on either an ETA 2893-2 or Sellita SW330-1. Which one your watch will have is basically luck of the draw – but also note that most of the older pieces are ETA vs newer having the Sellita. There may still be some of the ETA pieces out in the wild (pre-owned for example), but most of the newer GL293 powered watches available are based on the Sellita SW330-1.

In a newer (Invicta owned) Glycine Airman catalog, the brand has dropped the GL 293 caliber number and simply lists the movement as: “Swiss made automatic SW330 GMT”.

How do I know which movement is in my watch?

Throughout the official Glycine documentation and technical data, they only refer to the caliber GL293 as a Swiss automatic movement. ETA and Sellita both engrave their logo and caliber number below the balance wheel, however, the easiest way to tell if your Glycine watch has the ETA or Sellita is by the jewel count on the rotor. If your GL 293 powered watch has the ETA 2893-2, it will have 21 jewels. If your watch has the Sellita caliber SW330-1, the jewel count is 25. The A07 Valgranges movements have 24 jewels.

Why are they the same caliber number?

Glycine is currently owned by Invicta watch Group, which has been known to change base calibers in their watches while maintaining the same caliber number. Even though the SW330-1 is a clone of the 2893-2, they are not the same movement. For that reason, it would be beneficial to the watch community if they identified the movements with different caliber numbers, or at least added an indicator such as GL293-2. Since the GL293 can be either an ETA or Sellita, you might not know which you are getting, especially from sellers that don’t show the back of the watch.

More caliber confusion:

Although the GL 293 is often found in GMT watches, Glycine appears to have two different versions of the same caliber number: GL 293-GMT and GL 293-Purist. This information is based on what is found in an official instruction manual here. This caliber listing is focusing on the GL 293-GMT but may possibly spawn another post to address the “Purist” version. Was this a mistake and they actually meant to call the non-GMT caliber the GL 224? Please comment below if you have a non-GMT watch with a movement signed GL 293.

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1 year ago

I believe the Purist version is a 24h only version. That is, they likely used the same movement and removed the regular/12h hour hand, and perhaps the quick set function of the GMT hand (which is used as the hour hand).

Review: Glycine Airman No.1 Purist – Watch Blogs
1 year ago

[…] the Airman No.1 GL0371, Glycine has stepped up the game. The GL293 movement is still called the GL293, but it has been […]

22 days ago

Does anybody know, if this a true 24hr calibre? I want at least one watch that does NOT have an annoying 12hr main dial, as I absolutely hate AM/PM. I know that many in USA do not like even small 24hr subdials, because they never learned to use 24hr time, but in Northern latitudes with long winter nights and short days, I find any 12hr clocks and appointments confusing, because too many times, people are not clear what time of day they mean! I grew up in Europe with 24hr schedules everywhere, from TV-guides to train schedules, and they are… Read more »

6 days ago
Reply to  Zachmonoda

I have a GL0377 using this movement, and it’s a true 24 hour watch, although the dial’s marked AM on the right and PM on the left. And as you’d expect, the hour hand moves like a regular hour hand, not a quickset style. It just 24 hours to make on circuit of the dial.

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